env: Always call env_release in group_release

Remove unnecessary #ifdef CONFIG_DISABLE_ENVIRON.
This makes sure environment resources are always cleaned up,
regardless of configuration.

Signed-off-by: ligd <liguiding1@xiaomi.com>

sched/group/group_leave.c

@@ -104,11 +104,9 @@ group_release(FAR struct task_group_s *group, uint8_t ttype)
 
   fdlist_free(&group->tg_fdlist);
 
-#ifndef CONFIG_DISABLE_ENVIRON
   /* Release all shared environment variables */
 
   env_release(group);
-#endif
 
   /* Destroy the mm_map list */